ROI reaching into the two year spectrum, revenue going under $1... Cryptos have acrewed too much hype and now we're buckling under the weight of all the new hobby miners and affluent individuals trying to look clique (there is a thread right here in mining altcoins). Armageddon is nigh.
BBR and Pascal could still use optimizing. That's definitely a open window... Otherwise, there isn't much left unless something new comes along.
Actually considering selling off some of my rigs to buy antminers.
If you're ROI is reaching into two years already (just heading into a dry period) you might be a plug and play hobby miner yourself. I'm still below 1 year to ROI currently (including the cost of the rest of the rig per card) even with 970s with $0.13 kWh.
A $400 GPU on $1 a day in revenue, $.5 in power, you're looking at 2.2 years. Even with low power cryptos (mining Equihash) you're still looking at more then a year and a bit extra before ROI and that's extremely niche, which doesn't carry over to any other algo.
Not sure where you're mining, but there isn't anyway you're getting 1 year ROI with $400 cards (assuming you're thinking of prices before the 1XXX series came out) and .13Kwh power. I'd like to see your math on that. I've been around here just as long as you have, including 'dry spells', this is the first one that has been caused by over inflation of network hash and not cryptos crashing.
You shouldn't ever consider investments solely based off of resale. If you can't make money with it, it's not worth purchasing. Hardware isn't something you can easily exchange back to cash without taking a pretty big hit on it.